A few simple things. When you start your car it locks the doors, when you shut it off it unlocks the doors. Before this I was required to unlock the doors before exiting my vehicle - annoying.

I estimate 1500 foot signal distance on the very small remote key.

I give it a 3 on ease of use because I don't even know how many times I've accidentally started it by mistake with remote start feature. I know of at least 3 that someone has told me about. "hey, your car is running outside". Ooops. Always happens when the keys are in my coat pocket with other things.